News: You can measure the capacity of you battery your self via your N900 using some scripts (NOTE: Not the method the battery's in this thread was tested with, this was done with more consistent equipment)impeham made a script to make the battery measuring much simpler get it here

This is a new Thread to sum up battery's bought from EBAY, DX and else where.
This is a thread to show people where to buy and where not to buy.

Update: Battery's are now sorted after capacity (Real) and will only display battery's that can be bought, update still in progress, also need a new confirmed source for SCUD.
Old results are in post #6

-------- List of whats next ------- Bought and waiting for delivery -----

---- Future Test -----

--- Testing with eqipment ----
I use a charger/discharger for RC systems, it gives the mAh value when it charges and discharges.
My procedure is to charge the battery for testing completely up, then discharge it completely down, this gives me the mAh when discharging, now i charge the battery all the way up again, this gives me the mAh again, now the results i post here are the best "score" the battery achieves.
All battery's are first subject to 5 charge cycles, this is to get the best result, it of course does only mean a gain of 5 - 20mAh but it still counts.

--- Video testing will not be done anymore since the mAh test is all that is needed ---
My video testing on the phone is done with videos converted to H.264 to the limit of what the phone can handle, and im using custom brightness level 3, which is brightness 160 so that consumes some power.

--- old news ---
First MOD was with the 2 fake ys4u battery's.
of course this has no real benefit because of the low capacity.

--------- Mod 2 - 2x 'christgift' ---------

Second MOD has the 2x 1250mAh battery's from 'christgift'

Have not included a schematic because this new 2512mAh battery uses the circuit from one of the new battery's, so now the circuit is where it normally is, and now there are only 2 wires (+ & -) to worry about.

The 2mm DC has a direct connection to the battery's before the protection circuit, i use a dedicated charger this way.

The new battery really really works
Can really feel the 2512mAh or the 90%+ increase in capacity. If any of the new battery's that are in route are better (1300mAh+) than it would be MOD nr 3.

And so far it's 25$ for 2x battery's and mugen cover.
Of course the price so far has been higher because of all the battery's i have bought, but that is all so for testing purposes and to make a big buyers guide for you out there.

--------- Mod 3 - 2x Japod ---------

This 3 mod has 2x Japod 1350mAh battery's and has a total of 2763mAh, a 109% increase in capacity from the stock original nokia battery but does cost 10$ more than mod 2.

ATTENTION: Mugen has changed it's policy on selling these covers, now you have to submit a order nr. for previous bought mugen battery... or you can submit a picture of your broken cover to prove that you have bought a mugen cover/battery before. This of course makes it very hard/impossible to make a dual battery....NEWS (11/8) octagonhead tried to order a cover with a random/fake order number and it worked, so as stated input 50002XXXX (replace the x's with some small random number, less than 3000) in the previous order nr, and until mugen again scratches their head this should work.
How to buy the mugen cover.
Go to https://www.mugen-power-batteries.co...backdoor.html# and order HLI-N900XL, dont worry about if you never have ordered a mugen battery they don't check, as of now i have got 3 covers and i have never bought any mugen battery's ever.HtheB wanted to add that if you use the voucher code FACEBOOKSPECIAL you get a 7% discount (this if for everything on the mugen website, not just the XL-Cover)

And if anybody else have bought battery's and want to share there experience, please do.

Also if anybody have some battery's that they want to see tested please link here also

A good home test is simply to compare runtime with continues video play, put 2-3 movies on your phone and compare original battery to the battery you bought. than it's just a matter off leaving the phone alone to play movies and just checking up on it with 10min intervals.

My N900 is only about 1 month old so my original battery is pretty fresh.

--------- Battery Meter ---------

I have been doing discharge tests on the original battery to make a graph since im very tired of the normal battery meter that doesn't work very well.

So here is my QBW script for my own meter Version 1.1
This meter is precise to 2% since my discharge graph is only made with 2 digits.
But it really shows you the REAL remaining capacity (+/- 2%) and also current voltage.
The output is "3.800V - 50.0%"

UPDATE: Have made a new small V1.6 of the meter with LED notification when battery is 15% and lower and now also indicates when charging.

NOTE: if you have any problems with the display the fix is here http://talk.maemo.org/showthread.php?t=70590
This is to fix the display if it shows a weird %.NOTE: As of power kernel v47, there has been another display error caused by dual mv output, the fix is here

Change log:Ver 1.6: Same as V1.5 but added "Charging" text when chargingVer 1.5: Small design with LED notification when <15%Ver 1.4: Same as V1.3 But now with LED notificationVer 1.3: Same as V1.2 But code has been refined thanks to No!No!No!Yes!Ver 1.2: Now with background color to give a less dull and more visual detail of the current battery capacityVer 1.1: Just an update, changed % to 1 digit since it never shows more anyway

--------- Q & A ---------

Decided to make this because many of the same questions keep coming up, and it is understandably since there is over 300 posts now, it can be hard to find something specific.
This is new, and will be going through the hole thread, this will take some time......

Q: Can i use 5800 XL battery instead of Dual or Mugen battery?A: No, the pins are on the wrong side, you would think it would work but please read a few posts ahead from here

Q: What is the lowest Voltage before the phone shuts off?A: 3.3V or 3300mV is where the phone sets the limit.Q: Is the battery empty at 3.3V?A: Pretty much, on a normal 1320mAh battery you will at this point have a maximum of 25mAh left before hitting 3.0V, and from 3.0V to 2.2V (ABSOLUTE MINIMUM) there will be 5mAh more.

Q: Doesn't the mugen cover make the N900 massive/thickA: It's not to bad, but it has a funny advantage, it is easier/better to type on the keypad

Q: my battery only shows 1222mAh not 1320mAhA: This is not accurate because this is set by a resistor, this means you can make your battery report anything from 200mAh to >3000mAh, this has no relevance, my test is like i wrote in post #1, based on equipment to measure capacity.

--------- side note ---------

Now that i have various battery's laying around i made a small pocket flashlight, this is made with a mix of white and warm white flat top LED's and the 2 battery's from 'ys4u'.
The mix of warm white and white is to get a neutral white 'color'.
Only has about 2 hours runtime on the poor crappy battery's.

First MOD is with the 2 fake ys4u battery's.
of course this has no real benefit because of the low capacity of the battery's only slight better, but can't wait to get some good battery's to make a battery thats 2000mAh+.

The 2.5mm DC has a direct connection to the battery's before the protection circuit, i use a dedicated charger this way.

Will correct the pics later for better clarity.

damn,your phone looks really fat.does it fit in your pocket?
or do you have to carry a special bag for it????

damn,your phone looks really fat.does it fit in your pocket?
or do you have to carry a special bag for it????

It fits fine in my pocket
its not that bad as many think, and for now it's the only way to get heavy use of the computer/phone.
Lithium battery's will get better, read that with the help of nano technology the capacity can get up to 10x what it is now.
Would be cool with a battery with 10000mAh+ or as i would say 10Ah+, this will of course need a good charger or some time to make a full charge from empty.

High Capacity 1500mAh BL-5J Battery (Eastmaze)High Capacity 1500mAh BL-5J Battery for Nokia Cell Phone
Capacity for this battery should be 1500mAh
After VERY extensive testing the capacity was 1300mAhNOTE: This battery was hard to test because it has a very good protection circuit, and my charger charges the battery's to the MAX!!!
This battery does not do what it says it will do but it at least has the same capacity as the orig. nokia battery

BL-5J Replacement 3.7V 1320mAh (Dealextreme)BL-5J Replacement 3.7V 1320mAh Li-Ion Battery for Nokia 5800
Capacity for this battery should be 1320mAh
After extensive testing the capacity was 320mAh !!!!NOTE: was expecting 500mAh since i know this battery is fake, but 320mAh!!! damm this battery sucks.... hehe

EXTENDED 1500 mAh BATTERY FOR NOKIA N900 (londonmagicstore)EXTENDED 1500 mAh BATTERY FOR NOKIA X6 5230 5800 N900
Capacity for this battery should be 1500mAh
After extensive testing the capacity was 900mAhNOTE: can see through the paper cover that it says 1000mAh....

HIGH CAP GOLD BL-5J BATTERY FOR NOKIA N900 (EBAY)HIGH CAP GOLD BL-5J BATTERY FOR NOKIA N900 5800 XPRESSM
Capacity for this battery should be 1930mAh
After extensive testing the capacity was 1250mAhNOTE: Fake battery but still good since it is close to normal capacity of 1320mAh

SCUD 1420mAh Nokia BL-5J Battery (aliexpress)scud 1420mAh Nokia BL-5J Battery
Capacity for this battery should be 1420mAh
Retested by Estel, and the capacity was 1250mAhScud changed this battery to fit all nokia models, this is no longer the champion

MaXXimus 1600 mAh Nokia 5800 battery (maxximus.pl)MaXXimus 1600 mAh Nokia 5800 battery
Capacity for this battery should be 1600 mAh
After extensive testing the capacity was 1250 mAhNOTE: Tested by 'Estel'
Link provided redirect to google-translated (Polish to English) version of battery description. build-in buy function is valid only for addresses in Poland, but they're willing to send abroad (for higher price) if you contact them via contact form. If only would anyone want to buy their overpriced battery It seems to me that it's same battery as christgift is selling, only rebranded.

It fits fine in my pocket
its not that bad as many think, an for now it's the only way to get heavy use of the computer/phone.
Lithium battery's will get better, read that with the help of nano technology the capacity can get up to 10x what it is now.
Would be cool with a battery with 10000mAh+ or as i would say 10Ah+, this will of course need a good charger or some time to make a full charge from empty.

In a few test runs it's come out as 1310 - 1330 mAh using N900's own battery fuel gauge chip, and assuming RS=21 as determined experimentally by one of the kind sould in #meego.

Impressive that it's as good or better than original Nokia BL-5J, which iirc tested out as 1250-something with the same method.

Internal resistance "feels" like its lower, but that might just be a sign that there's no protection circuit in it...

The bq27200 fuel gauge doesn't use any method close to a "proper" one. It just integrates current discharged, until it reaches 3248mV (and the point at which this happens varies with system load, of course), and then assumes that the battery is at 6%, calibrates charge meter according that. The 0% is assumed to be at 3V.
Under normal operations N900 doesn't reach voltages this low.

My 2400mAh mugen showed up as 2400mAh with the same method when new, and now after some months of abuse it shows up as 2300mAh.

When you say "dedicated charger", do you mean an actual Li-Ion charger, or are you hooking up some random Nokia "charger" powersupply?

Yes an actual Li-Ion charger, i have several from basic just working stuff to semi-pro and pro chargers.
Could all so hook it up to some random Nokia charger, but than i would have to monitor the battery or else it would go way beyond 4.2V and potential cause the battery to vent with or without fire or explode.

The best thing with my own custom "charge port" is that i can charge with 1C no matter how big the battery is, which means that when i get some good battery's with 1200mAh+ than i can charge the battery with 2.4A, this will mean that charge time would be max 1.5 hours.
Or could charge for 30min and have enough power to last a day with good usage.